Eleoteic bueglae alaem



(No Model.) 2 SheetsSheet 1.

E. E CARR.

ELEGTRIG BURGLAR ALARM.

No. 357,815. Patented Feb. 15, 1887.

Fig.1.

' INVBNTOR:

ATTORNEYS.

N. PETERS. Phofluuthngnphar, Wuhirlgiom D. Q

(No Model.) I i 2 Sheets-Sheet 2."

r E. E. CARR.

ELECTRIC BURGLAR ALARM. Nb. 357,815. Patented Feb. 15, 1887.

' Figafi WITNESSES: INVEN TOR ATTORNEYS.

* UNITED STATES EDXVARD E. CARE, OF

PATENT OFFICE.

OHALMERS, INDIANA.

ELECTRIC BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 357,815, dated February15, 1887.

Application filed June 1, 1886. ,Serial No. 203,851. (No model.)

To a whom, it may concern.-

Be it known that I, EDWARD E. CARR, of Chalmers, in the county of Whiteand Statevof Indiana, have invented a new and useful Im- 5 provenlent inElectric Burglar-Alarms, of

which the following is a specification.

My invention relates to electric burglaralarms which are designed to beapplied to doors and windows of dwellings, barns, stables, or otherbuildings in such a manner that the surreptitious raising of a window oropening of a door shall be made to break an electric circuit and sound acontinuous alarm on a bell.

My invention consists in the peculiar arrangement of the circuit andcontacts and means for locating the break, which I will now proceedto'fully describe.

Figure 1 is a front elevation of the alarmboard, showing thebattery-connections and the electric circuits. Fig. 2 is asectional viewof a window sash and frame, showing the means for breaking the circuitby the raising of the window. Fig. 3 shows a modified means for breakingcircuit as applied to-a door.

In the drawings, A represents an electrical bell of that pattern inwhich the electric circuit is alternately made and broken to sound acontinous alarm. For this-purpose the battery B is connected for thevibrating circuit with the binding-post 2' by wires km, and withbinding-postj by wires a 0. From binding-post i a wire leads to themagnets a a, and from the magnets to the adjustable contactf, and fromthis contact to spring e on the armature Z), through the armature tospring h, and thence to the binding-post and the other pole of thebattery. The act-ion of this vibrating bell is as follows: \Vhen thecurrent is completed through the circuit, thus described, the armaturebis attracted, and the hammer 0 carried thereby is made to strike thebell. As the armature is thus attracted the spring 0 is made to leavethe contact f, and the current being broken the armature flies backagain from the tension ofthe spring h,which thus re-establishes thecircuit and gives another stroke on the bell. This is the ordinary formof vibrating bell. In connection with the circuit thus described anotherwire, 1) q, connects with the contactfof the bell, and this wire,together with 'l; m it, forms the long circuit, or the circuit in whichthe several circuit-breakers are placed, which are designed to be placedat the doors and windows of the house to secure the same, and all ofwhich are contained in the circuit]: map g, which is a normally-closedcircuit, and which holds the armature b away from the contactf, so thatthe short vibrating circuit is not completed as long as the long circuitis unbroken. As soon, however, as the long circuit is broken by theraising of a window, opening ofa door, or cutting of the wire, thevibrating circuit is established and a continuous'alarni is rung uponthe bell.

In order to have the requisite number of circuit-breakers for thedifferent windows and doors of a house and keep them all under inspection at a single point, I employ a series of plates, 0 G G" O, whichare parallel with but insulated from each other,and connecting withthese plates are a series ot'loops, E E'E' each of which loops has acircuit-breaking device, F F F, &c., in the same, which is adapted to befitted into a window or door,so as to be operated by the opening of thesame. These circuitbreakers consist simply of two springs, S S,insulatedfrom each other and held in a framed, which springs are normally incontact when the springs are pressed together by the window when closed,and which, when relieved of pressure, separate and break the circuit. Infitting this circuit-breaker to the window, Fi 2,its frame t is screwedinto the window'fraine, with the bend of one of the springs,S,projecting toward the edge of the sash, and the upper part of the edgeof the sash by hearing against this bend forces the two springsincontact. The principal portion of the edge of the sash below the upperpart is channeled or grooved, so that as soon as the sash is raised thebend of the spring S flies into the groove, and thereby breaking thecontact between springs S S opens the long circuit and permits thevibrating circuit to act and sound an alarm. It will thus be seen thatwhen the circuit-breakers F F F are in place in the windowsand thewindows closed the current of the long circuit passes down from oneplate,

0, to the circuit-breaker F, and up thence to the plate 0, then downagain to the-circuitbreaker F in another window and back to the.

next plate, 0, and so on, and as soon as anyof the circuit-breakersopen, from the surreptitious opening of the window or door, thevibrating current is established and the alarm given. Now, to locate thebreak from any given central point, the plates 0 O, &c., are arranged asan indicator, and a metal pin, D, is constructed so as to be inserted inholes between the plates, and by touching both adjacent plates toconnect the same, so that when an alarm is sounded the pin D issuccessively inserted in the several holes between the different plates,and when its insertion stops the alarm this serves to indicate the factthat the window was opened whose circuit-breaker is in connection withthe two plates between which the pin is inserted, for the reason thatthe pin re-establishes the long circuit which was broken at the window,and thus permanently breaks the vibrating circuit. It is easy,therefore, by placing suitable numbers or distinguishing-marks overthese plate to locate the break made by a burglar.

In adapting the circuit-breakers F to doors they may be placed either inthe hinge-joint or at the lockjoint; but I preferto locate them at thehinge-joint,and construct them as shown in Fig. 3, in which thehingeitself is employed by hoping a hole in oneleaf and placing an insulated screw therein, which is connected to one wire, and connectingtheother wire to the leafof the hinge, so thatwhen the dooris opened itpasses off the insulated screw, and when closed comes in contact withthe same.

For rendering the alarm inoperativefl place in the circuitwire 7cm(which forms part of both the long and the vibrating circuit) the platesZ Z, which areinsulated or disconnected from each other, except when themetal pin Z is inserted in a hole between the same. By taking out thispin it will be seen that both the long circuit and the vibrating circuitare permanently broken, and the doors and windows may thus in theday-time be opened and shut without sounding the alarm; A similar pairof detached plates, r r,with hole between them and detachable pin T isinterposed in the branch p q of the long circuit, the object of which isto permit the long circuit to be broken at the instrument for thepurpose of regulating or adjusting the vibration of the bell-ringingmechanism.

From the foregoing description it will be seen that only a singlebattery is used for both circuits, and the same wire is m it forms apart of both the long and the vibrating circuit. When the long circuitextends to a barn or other outbuilding,there is employed a groundwire ateach end to complete the circuit through the earth.

I am aware of the fact that an electric alarm- '7 bell has been combinedwith a short circuit for sounding a continuous alarm, and a longcircuit, which, when broken by the opening of a door or window, allowsthe short circuit to be operated, and I am also aware that a series ofswitch-plates for testing and locating the break in the long circnit isnot new, and Itherefore only claim the particular combination andarrangement of the parts shown and described.

Having thus described my invention, What I claim as new is- Thecombination, with the electric bell and battery connected by both a longand short circuit, as described, of the series of insulatorplates 0 G GO, the wires 1) q,connected with

